import Vue from 'vue'
import Router from 'vue-router'

// 普通加载
import Login from '../components/Login.vue'
import Home from '../components/Home.vue'
import Welcome from '../components/Welcome.vue'

import Users from '../components/user/Users.vue'
import Rights from '../components/power/Rights.vue'
import Roles from '../components/power/Roles.vue'

import Cate from '../components/goods/Cate.vue'
import Params from '../components/goods/Params.vue'

import GoodList from '../components/goods/List.vue'
import Add from '../components/goods/Add.vue'

import Order from '../components/order/Order.vue'
import Report from '../components/report/Report.vue'

// 懒加载
// 分组1
// const Login = () => import(/*webpackChunkName: "login_home_welcome"*/ '../components/Login.vue')
// const Home = () => import(/*webpackChunkName: "login_home_welcome"*/ '../components/Home.vue')
// const Welcome = () => import(/*webpackChunkName: "login_home_welcome"*/ '../components/Welcome.vue')
// // 分组2
// const Users = () => import(/*webpackChunkName: "users_rights_roles"*/ '../components/user/Users.vue')
// const Rights = () => import(/*webpackChunkName: "users_rights_roles"*/ '../components/power/Rights.vue')
// const Roles = () => import(/*webpackChunkName: "users_rights_roles"*/ '../components/power/Roles.vue')
// // 分组3
// const Cate = () => import(/*webpackChunkName: "cate_params"*/ '../components/goods/Cate.vue')
// const Params = () => import(/*webpackChunkName: "cate_params"*/ '../components/goods/Params.vue')
// // 分组4
// const GoodList = () => import(/*webpackChunkName: "goodlist_add"*/ '../components/goods/List.vue')
// const Add = () => import(/*webpackChunkName: "goodlist_add"*/ '../components/goods/Add.vue')
// // 分组5
// const Order = () => import(/*webpackChunkName: "order_report"*/ '../components/order/Order.vue')
// const Report = () => import(/*webpackChunkName: "order_report"*/ '../components/report/Report.vue')

Vue.use(Router)

//创建路由对象
const router = new Router({
  routes: [
    { path: '/', redirect: '/login' },
    { path: '/login', component: Login },
    { 
      path: '/home',
      component: Home,
      redirect: '/welcome', //当一访问/home，则重定向到/welcome，
      children: [//子路由
        {path: '/welcome', component: Welcome},
        {path: '/users', component: Users},
        {path: '/rights', component: Rights},
        {path: '/roles', component: Roles},
        {path: '/categories', component: Cate},
        {path: '/params', component: Params},
        {path: '/goods', component: GoodList},
        {path: '/goods/add', component: Add},
        {path: '/orders', component: Order},
        {path: '/reports', component: Report},
      ] 
    },
  ]
})

//挂载路由导航守卫
router.beforeEach((to, from, next) => {
  //to:将要访问的路径 from: 从哪个路径来 next：一个函数，表示放行 next()--放行， next('/login')--强制跳转
  if (to.path == '/login') return next();//是访问登录组件时，直接放行
  //获取token
  const token = window.sessionStorage.getItem('token');
  //没有token，则回到登录页面
  if (!token) return next('/login')
  //有则直接放行
  next()
})

export default router  // 暴露路由